Good, but brokenly hard at end.
The game has good graphic, good basis of gameplay, and a thorough upgrade system. However the later stages are ridiculously hard, and nekon attack levels are broken/unwinnable. I'm at level 18, and the boss there takes up half the screen and throws a ridiculous amount of firepower out, to the point where the whole bottom half is filled with bullets and the only choice is which you want to get hit by. In nekon attack, with the exception of the first few challenges, you can not win. I was able to go through a whole challenge killing every single ship thanks to spamming mega blast + bonus magnet and it still wasn't enough.